This could qualify as popular media. In my opinion Facebook is better. Twitter is entirely revolved around posting what one is doing, which I find quite bland. You can do that (though not as well as Twitter does) and much more on Facebook.
I like facebook more because here in Germany we already have a community ("wer-kennt-wen" which is based on havin friends and people you now in whole germany. so for us germans facebook is someting like wer-kennt-wen but international. You can add friends in th whole world, write messages, share photos with them and much more.
No contest, facebook. I think it's a lot broader in the things you can do compared to twitter. And I, personally, don't care about what other people are doing constantly.